Co-Design of Strain-Actuated Solar Arrays for Spacecraft Precision Pointing and Jitter Reduction

Chilan, Christian M.; Herber, Daniel R.; Nakka, Yashwanth Kumar; Chung, Soon‐Jo; Allison, James T.; Aldrich, Jack; Alvarez-Salazar, Oscar S.

doi:10.2514/1.j055748

Cited by 29 publications

(17 citation statements)

References 44 publications

(31 reference statements)

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“…While many co-design problems are appropriately partitioned with control and plant specific objective function terms [2, 9-11, 13-15, 27], others necessitate the general objective form in Eqns. (1a)-(1b) [1,2,4,16,18]. These general objectives may only include one term or terms that are typically only classified as "control" objective terms.…”

Section: Objective Functionmentioning

confidence: 99%

“…If the inner loop contains p, then the necessary conditions are analogous to the simultaneous conditions in Eqn. (18) with p replacing x p .…”

Section: Co-design-nested Strategymentioning

confidence: 99%

“…Recently, numerical solution methods have been utilized to solve co-design problems that are not captured by previous problem definitions [7,8]. Nontraditional problem formulation elements include system-level objective functions, general inequality path constraints, and general boundary conditions [1][2][3][4][5][16][17][18]. With these nontraditional problem elements, much of the previous work in co-design theory does not apply.…”

Section: Introductionmentioning

confidence: 99%

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Nested and Simultaneous Solution Strategies for General Combined Plant and Controller Design Problems

Herber

Allison

2017

Volume 2A: 43rd Design Automation Conference

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In this article, general combined plant and controller design or co-design problems are examined. Previous work in co-design theory imposed restrictions on the type of problems that could be posed. This article lifts many of those restrictions. The problem formulations and optimality conditions for both the simultaneous and nested solution strategies are given. Due to a number of challenges associated with the optimality conditions, practical solution considerations are discussed with a focus the motivating reasons for using direct transcription in co-design. This article highlights some of the key concepts in general co-design including general coupling, the differences between the feasible regions for each strategy, general boundary conditions, inequality path constraints, system-level objectives, and the complexity of the closed-form solutions. Three co-design test problems are provided. A number of research directions are proposed to further co-design theory including tailored solution methods for reducing total computational expense, better comparisons between the two solution strategies, and more realistic test problems.

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Section: Objective Functionmentioning

confidence: 99%

“…If the inner loop contains p, then the necessary conditions are analogous to the simultaneous conditions in Eqn. (18) with p replacing x p .…”

Section: Co-design-nested Strategymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Nested and Simultaneous Solution Strategies for General Combined Plant and Controller Design Problems

Herber

Allison

2017

Volume 2A: 43rd Design Automation Conference

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“…Recently, electric propulsion systems have been proposed as viable UQSAS options, but these actuation systems are clearly fuel-limited and are typically designed as low-thrust propulsion systems that do not have enough control authority to support a high-bandwidth pointing control loop. In contrast, Strain-Actuated Solar Arrays (SASA) have been recently introduced as a propellant-free, UQSAS alternative [9,10] that can support a high-bandwidth pointing control loop assuming a high force-density piezoelectric-based actuation system.…”

Section: Introductionmentioning

confidence: 99%

“…In [10], replacing the RWA with SASA to achieve spacecraft slewing, attitude control, and momentum management was investigated. In [9,11], a design optimization of both the control architecture and structural geometry was reported. In contrast to earlier work, this article presents a complete derivation of the spacecraft-SASA dynamics in which the infinite-dimensional nature of the flexible appendage is modeled using Euler-Bernoulli beam theory [12,13].…”

Section: Introductionmentioning

confidence: 99%

Nonlinear Attitude Control of a Spacecraft with Distributed Actuation of Solar Arrays

Nakka¹,

Chung²,

Allison

et al. 2019

Journal of Guidance, Control, and Dynamics

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This article presents a novel control architecture and algorithm for precision attitude control of a one-degree-of-freedom dynamic model of a spacecraft. To achieve a parametric model-based control design approach for this new spacecraft actuation and control architecture, the nonlinear dynamics of the open-loop plant are modeled as an Ordinary Differential Equation (ODE)-Partial Differential Equation (PDE) system. The ODE describes the spacecraft single-axis rigid-body rotation, and the PDE describes the spatially continuous flexible dynamics of the solar array including an allocation for a multi-input distributed piezoelectric actuation system bonded on the solar array. This distributed actuation system is called strain-actuated solar arrays. Based on this plant model, a nonlinear ODE-PDE feedback controller for attitude trajectory tracking and slewing is presented with detailed stability proofs. From an end-to-end point of view, the controller drives the distributed piezoelectric actuator patches with voltages that induce bending deflections in the solar arrays, causing controlled reaction torques on the bus to yield target-following motions and precision spacecraft attitude control. The proposed algorithm can be extended to any distributed actuation system with appropriate control input to actuator input mapping.The benefits and limitations of the proposed attitude control method using strain actuation

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Robust monolithic versus distributed control/structure co-optimization of flexible space systems in presence of parametric uncertainties

Sanfedino,

Alazard,

Kiley

et al. 2023

Struct Multidisc Optim

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Co-Design of Strain-Actuated Solar Arrays for Spacecraft Precision Pointing and Jitter Reduction

Cited by 29 publications

References 44 publications

Nested and Simultaneous Solution Strategies for General Combined Plant and Controller Design Problems

Nested and Simultaneous Solution Strategies for General Combined Plant and Controller Design Problems

Nonlinear Attitude Control of a Spacecraft with Distributed Actuation of Solar Arrays

Robust monolithic versus distributed control/structure co-optimization of flexible space systems in presence of parametric uncertainties

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